So I went to replace my water pump tonight. Suffice it to say, I have a major cut/bump on my cheekbone, and one of the water pump bolts snapped off still in the pump and the block. So I'm F&%ked. Anyone have any idea how much this is gonna cost me to have a shop pull?

Did you get the pump off? Maybe the bolt is sticking out of the block enough that you can get it out. Replacing the pump isn't too bad a job just a bit tedious. I would give it another go tomorrow after you have rested and don't let it get you down. Did you remove the fan and shroud first?

Only the head of the bolt came off - if I take off - and that's a bif if, considering, would I be able to pull off the pump? Is the head/clamping power of the bolt all that hold sit on, or is it threaded into the pump too?

The pump will come off as long as the head is gone. Assuming it broke clean at the head as many do there will be a little of the bolt sticking out once the pump is removed. The bolt may come out easily as there is no pressure on it now, or it could be stuck a little in the block, but I believe you can do the job. If I get frustrated when working on something it usually helps to walk away and try again later after I have calmed down. I worked on a stuck engine mount once for three hours and was no closer then than when I started, the next morning it took 15 minutes to remove the mount.

Pull the rest of the bolts. you may have to remove the PS bracket so you can pull straight back, after that, soak that bolt in penetrationg oil, hit it with heat, and repeat back and forth. Grab what remains of the bolt with vicegrips and get it out of there. Then go buy some new bolts and have at it.

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Get the pump off and spray the stud with some PB Blaster. Wait, repeat, wait, repeat. No need to rush the process. I have let stuck bolts set over night with PB Blaster working on them and come morning they tun out nicely.